Opinions on max effort cam for LQ9...
07-09-2024, 05:47 PM
#1
Opinions on max effort cam for LQ9...
With a twist.
LQ9 short block, ported 243s, LSXRT 102, LT headers, freeflowing exhaust system with cut outs. E85, 4L80E, 4.56 gears, 4400-4450 lb truck w/o driver.
Currently have a 228/236 @ .050 cam .598"/.602" lift 115 LSA + 0
Goal is to go as fast as possible, still maintain some sort of streetability. But, not be a daily driver anymore. Likely will end up with a 4000-4400 converter.
Would you stick with that cam? Or go with something else? I ran a nearly identical cam in an LS1 based 383, AFR 205s, FAST 90mm, LTs, etc, etc. It ran really well on 93, but in a 900lb lighter vehicle with 28s and 3.73s
I was previously convinced that this cam was "it." Now, I'm second guessing myself.
LQ9 short block, ported 243s, LSXRT 102, LT headers, freeflowing exhaust system with cut outs. E85, 4L80E, 4.56 gears, 4400-4450 lb truck w/o driver.
Currently have a 228/236 @ .050 cam .598"/.602" lift 115 LSA + 0
Goal is to go as fast as possible, still maintain some sort of streetability. But, not be a daily driver anymore. Likely will end up with a 4000-4400 converter.
Would you stick with that cam? Or go with something else? I ran a nearly identical cam in an LS1 based 383, AFR 205s, FAST 90mm, LTs, etc, etc. It ran really well on 93, but in a 900lb lighter vehicle with 28s and 3.73s
I was previously convinced that this cam was "it." Now, I'm second guessing myself.
07-10-2024, 08:14 PM
#3
With E85, mill the 243 heads down .030", use Cometic .044" thick gaskets, and @Summitracing SUM-8710R1 230/242 113+3 .625/.605. Plan on shifting a little past 6500rpm.
07-13-2024, 12:40 PM
#5
With E85, mill the 243 heads down .030", use Cometic .044" thick gaskets, and @Summitracing SUM-8710R1 230/242 113+3 .625/.605. Plan on shifting a little past 6500rpm.
Comp - 231/239 .617/.624 113 or 231/247 .617/.624 113
Tick - 237/242 .633/.608 111+3 or 233/240 .627/.607 112+2
TSP - 232/234 .600/.600 112 or 231/234 .629/.615 111
07-13-2024, 09:36 PM
#7
I'm going to get my damn 12 second time slips out of the current LQ4, 862 heads, Chopacabra combo. I want to test a set of milled 799s on it before I pull this engine too. For "science"
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aslack99 (07-14-2024)
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07-15-2024, 01:13 PM
#8
what size tires on the truck? of the options above I like the lower lift TSP grind. In a heavy truck bigger isn't always better. I've run a 231/239, 237/242, 226/226, 228/232, 226/226, 247/255 in various 5.7 & 6.0 cathedral head combos. From memory I gained nothing going from a 226/226 to a 231/239 on a 5.7 with ported patriot 226 heads. no time gained running N/A, but drivability suffered. some of those wide split specs seem more geared towards square port heads. be sure to measure PTV before any of those cams with the
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Bluecollar Hotrods (07-15-2024)
07-15-2024, 01:50 PM
#9
what size tires on the truck? of the options above I like the lower lift TSP grind. In a heavy truck bigger isn't always better. I've run a 231/239, 237/242, 226/226, 228/232, 226/226, 247/255 in various 5.7 & 6.0 cathedral head combos. From memory I gained nothing going from a 226/226 to a 231/239 on a 5.7 with ported patriot 226 heads. no time gained running N/A, but drivability suffered. some of those wide split specs seem more geared towards square port heads. be sure to measure PTV before any of those cams with the
I agree on checking PTV, anything approaching 23x on the intake side is usually where I start getting concerned.
Based on your results, maybe I need to stay with my 228/236 cam.
